R1 Concepts 623-31088L RNC Series Drilled Brake Rotor

The R1 Concepts 623-31088L RNC Series Drilled Brake Rotor is a high-performance replacement rotor engineered to deliver confident, consistent stopping power. Constructed from G3000 grade cast iron, this rotor meets or exceeds OEM specifications for a direct-fit installation with no modifications required.

The precision cross-drilled hole pattern enhances heat dissipation, reduces rotor surface temperature during demanding braking events, and helps evacuate gas and debris from the braking surface. Each hole is countersunk and chamfered to preserve rotor integrity and prevent stress cracking over time.

Key Features:

• G3000 grade cast iron construction for strength and long service life
• Precision cross-drilled design dissipates heat and reduces brake fade
• Countersunk and chamfered drilled holes prevent cracking
• Silver zinc plated coating provides corrosion resistance on non-contact surfaces
• Direct OEM replacement — no cutting, drilling, or modifications needed
• Designed for smooth, quiet, and consistent braking performance
• Left-side (driver side) rotor — sold individually

The 623-31088L is a left/driver-side fitment rotor from R1 Concepts' RNC lineup, ideal for street performance and everyday driving. The zinc-coated hat and vane areas resist rust and corrosion, keeping the rotor looking clean behind the wheel long after installation.